Welcome to FreeDOS

FreeDOS is an open source DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS.

It doesn’t cost anything to download and use FreeDOS. You can also share FreeDOS for others to enjoy! And you can view and edit our source code, because all FreeDOS programs are distributed under the GNU General Public License or a similar open source software license.

Classic games

You can play your favorite DOS games on FreeDOS. And there are a lot of great classic games to play: Wolfenstein 3D, Doom, Commander Keen, Rise of the Triad, Jill of the Jungle, Duke Nukem, and many others!

Legacy software

Need to recover data from an old business program? Or maybe you need to run a report from your old finance system? Just install your legacy software under FreeDOS, and you’ll be good to go!

Embedded systems

Many embedded systems run on DOS, although modern systems may instead run on Linux. If you support an older embedded system, you might be running DOS. And FreeDOS can fit in very well.

Dr. Mind is a PC adaptation of a well-known board game. The computer generates a secret color code, and the player has to figure out the exact pattern within 8 turns. After each turn, the computer provides clues about how many colors matched the solution. The game features a set of 24 pictures that are initially blured - every time you work out a valid code combination, you are rewarded with a picture. Published under the CC BY-ND 4.0 license, which is roughly equivalent to "freeware with source code". You can find it at SourceForge.

ZXSpectr is a ZX Spectrum emulator written entirely in Assembler. It runs under DOS, and pretty well also in Windows and DOS emulators, like Dosemu and Dosbox. Emulates 16k, 48k, Inves Spectrum +, Spectrum 128k (English and Spanish), Spectrum +2 (English, Spanish and French) and Spectrum +2A (English and Spanish). Features include Kempston joystick emulation, Real tape loading through soundblaster. Available under the GNU GPL from GitHub.

Mark Oleson writes: "For those that are interested, I ported LibreSSL to FreeDOS using OpenWatcom. It can be found on my GitHub" This repository contains a port of libressl, wattcp32, and wget to FreeDOS using the OpenWatcom compiler.

Ben Collver "recently built Tcl for DOS using DJGPP. This is based on the work of Georg Potthast and Viktor Wagner. These builds include Ck and Sqlite. Below are download links for Tcl 8.5.19 and Tcl 8.6.9." Ben also shared Tcl 8.4.20 built using DJGPP with Ck and Sqlite. We've also mirrored them at ibiblio. Thanks Ben!